samba domain as realm

[Christophe Deze]

hello
is it possible to use samba(+ldap) domain name as realm ?

i want  that if on a XP laptop plug on my NAS (switch)

DOMAIN1\username log on , the ldap+radius  is authentificate on DOMAIN1 
ldap server
DOMAIN2\username log on , the ldap+radius  is authentificate on DOMAIN2 
ldap server

the username can be identical but the ldap domain differente

my problem is that if the username exists in the DOMAIN1 ldap server, 
DOMAIN2\username will never get his good VLAN-id (from users file),
freeradius give him DOMAIN1\username vlan-id...

i 've try ntdomain realm but it doesn't work
any tutorial ?

thanks